I use a pinnable docking pane with a tree control inside it to navigate my workspace. Selecting different items on the tree shows and hides views in the SDI workspace area. If the workspace bar is unpinned then when I show a window in the SDI workspace area with CWnd::ShowWindow (SW_SHOW), the windows is displayed over the docking window. This is before the workspace window has retracted.

Is this a drawing clipping problem?

try to add this code:

BOOL CMainFrame::PreCreateWindow(CREATESTRUCT& cs)
{
 if( !CFrameWnd::PreCreateWindow(cs) )
  return FALSE;

 cs.style |= WS_CLIPCHILDREN|WS_CLIPSIBLINGS;

 return TRUE;
}

Tried it before and it doesn't work.

Any window that is obscured by an expanded pinnable window, will draw in the client area of the pinnable window before it retracts. My tree control embedded in a pinnable window selects different windows behind the pinnable window. As these windows are shown and redrawn, they overwrite the pinnable window's tree control. This is before the focus has shifted from the tree control and the pinnable window retracts. I can send an executable with the behaviour.

OK it's fixed.

I use a splitter window in the SDI mainframe. This needs the styles mentioned above in the call to CreateStatic ();